Sewing machines



March 28, 1961 H. HACKLANDER SEWING MACHINES l7 Sheets-Sheet 1m''k/l/l/l/l/A Filed Sept. 14, 1956 INVENTOR. Hans Hack/under a my.

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WITNESS ATTORNEY March 28, 1961 H. HACKLANDER SEWING MACHINES 17Sheets-Sheet 2 Filed Sept. 14, 1956 oom 5m man H. HACKLANDER SEWINGMACHINES March 28, 1961 17 Sheets-Sheet 3 Filed Sept. 14, 1956 527 526528 INVENTOR.

Hans Hack/under BY W ZTORNEY WITNESS March 28, 1961 I H. HACKLANDERSEWING MACHINES eta-Sheet 4 Filed Sept. 14. 1956 INVENTOR HansHack/under March 28, 1961 H. HACKLANDER SEWING MACHINES 5 t e e h w s te e h s 7 1 .mwm 6 I III] xflgrli l 1. an... M 2.? e .T... 06 p "m d LLim i a la a e n w F N: v: N m

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IN VEN TOR. Hans Hack/under ATT RNE Y March 28, 1961 H. HACKLANDER2,976,831

SEWING MACHINES Filed Sept. 14, 1956 17 Sheets-Sheet 6 H. HACKLANDER2,976,831

SEWING MACHINES l7 Sheets-Sheet 7 5 March 28, 1961 Filed Sept. 14, 1956m-m W .0 IL: ay/A2 II-E: 0 7

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INVENTOR. Hans Hack/under BY My ATTORNEY WITNESS W a i March 28, 1961 H.HACKLANDER SEWING MACHINES l7 Sheets-Sheet 9 Filed Sept. 14, 1956 IN VENTOR. Hans Hack/under BY W i TORNEY W/TNESS March 28, 1961 H. HACKLANDERSEWING MACHINES l7 Sheets-Sheet 10 Filed Sept. 14, 1956 IN VEN TOR. HansHack/under BY W r'roRA/n WITNESS F ig. 3!.

W fid ai March 28, 1961 H. HACKLANDER SEWING MACHINES Filed Sept. 14,1956 l7 Sheets-Sheet 11 T2 TI 207. 246

INVEN TOR. Hans Hack lander @1%/ TORNEY March 28, 1961 H. HACKLANDERSEWING MACHINES l7 Sheets-Sheet 12 Filed Sept. 14, 1956 I N VEN TOR.Hans Hack/under BY W ETTORNEY March 28, 1961 H. HACKLANDER SEWINGMACHINES Filed Sept. 14, 1956 IN VEN TOR. Hans Hack/under 1%TORNEY l7Sheets-Sheet 14 WITNESS March 28, 1961 H. HACKLANDER SEWING MACHINES l7Sheets-Sheet 15 Filed Sept. 14, 1956 0% R? we IN VEN TOR. HansHack/under WITNESS March 28, 1961 H. HACKLANDER SEWING MACHINES l7Sheets-Sheet 16 Filed Sept. 14, 1956 mm 5 om E mom a.

INVENTOR. Hans Hack/under ATQORNEY WITNESS W 0 14 March 28, 1961 H.HACKLANDER SEWING MACHINES 17 Sheets-Sheet 1'? Filed Sept. 14, 1956lllll' Fig. 37

I N VEN TOR. Hans Hack/under I W 9. 6%, 476 54-36 ATTORNE WITNESS 485wfi i nitd L SEWING MACHINES Filed Sept. 14, 1956, Ser. No. 609,836

13 Claims. (Cl. 112-220) The present invention relates to sewingmachines and particularly to high speed automatically lubricatedindustrial sewing machines which operate at speeds up wardly of 5000stitches per minute, and at such speeds, will form perfect stitching,will be eflicient and durable and quieter and vibration free, and whichalso will be neat and attractive.

One of the principal objects of this invention is to provide a sewingmachine in which a single basic machine is designed to be convenientlymodified and/or fitted with various attachment mechanisms to adapt themachine for a large number of different specific sewing operations.Accordingly, it is an object of this invention to provide a new andimproved universal attachment drive mechanism which can be used toactuate any one of a number of specific attachment mechanisms, 'whichdrive mechanism will be eificient and durable when used to drive anyselected one of the various attachment mechanisms, and which drivemechanism is designed into the machine, for purpose of appearance aswell as safety, in combination with a bracket-arm that is angledrelative to the bed to improve visibility at the point of stitchformation and a needle-bar actuating rock lever arranged in an optimummanner longitudinally of the bracket-arm.

It is a further object of this invention to provide a new and improvedalternating presser mechanism and specifically one adapted for use witha novel drive mechanism that is designed to be used to actuate any onevof a number of other attachments, and which at the same time will beeconomical, dependable, durable and efiicient. It is a further object ofthis invention to provide an improved looper mechanism for a chainstitch sewing machine the mechanics of which will adapt it for highspeed operation and to provide a looper mechanism in which the onlymotions imparted to the looper bar are axial reciprocation andoscillation, thereby facilitating making an oil-tight bearing and thusadapting it for use in an automatically lubricated sewing machine, aswell as to provide a looper mechanism which can be quickly and easilyassembled and adjusted. At the same time, it is an object of thisinvention to provide a looper mechanism which can be readily convertedfrom one in which the looper motion is transverse to the line of feed toone in which the looper motion is parallel to the line of feed.

It is a further object of this invention to provide an improved feedingmechanism that is adapted for high speed operation and which can bereadily modified from a plain to a diiferential feed, and in which, as adifferential feeding mechanism, the elevation of the parts issubstantially reduced, having in mind the end that the feed bar shouldbe substantially horizontal and that the path of the feed dog above thecloth plate should also be substantially horizontal. It is also anobject of this invention to provide a new and improved feed-dog heightadjusting means which is particularly useful in a differential feedingmechanism wherein the height of the main and auxiliary feed dogs will beadjusted simultaneously.

2,976,831 I Patented Mar. '28, 1961 It is a further object of thisinvention to provide a thread tension mechanism having a pair of opposedthread tension discs that are released by means of a releasing pinprojected between the discs, which mechanism is constructed and arrangedto prevent the shank of the releasing pin from being forced against theperiphery of the discs, and to provide a tension releasing mechanismcombined with the presser lifter mechanism and that is constructed andarranged to effect complete release of the tension mechanism during theinitial actuation of the presser lifter.

Fig. 1 is a front elevational view of a sewing machine embodying thepresent invention, partly broken away and in section.

Fig. 2 is a top plan view of the sewing machine of Fig. 1 with the topcover plate removed.

Fig. 3 is a head end elevation view of the sewing machine of Fig. 1 withthe face plate removed.

Fig. 4 is a vertical sectional view longitudinally of the sewing machineof Fig. 1.

Fig. 5 is a horizontal sectional view of the sewing machine of Fig. 1with the cloth plate and its supporting bracket and the bed cover plateremoved.

Fig. 6 is a fragmentary detail view in elevation of g a modification ofthe looper drive crank.

Fig. 7 is a fragmentary horizontal sectional view taken substantially onthe line 77 of Fig. 4 and illustrating the modified looper drive crankof Fig. 6.

Fig. 8 is a horizontal sectional View through the bracketarm ofthesewing machine illustrated in Fig. 1.

Fig. 9 is a vertical sectional view through the standard of the sewingmachine illustrated in Fig. 1 andtaken substantially on the line 9-9 ofFig. 4. p I

Fig. 10 is a sectional view taken substantially on the line 10-10 ofFig. 5.

Fig. 1 1 is a fragmentary sectional view taken substantially on the line11-11 of Fig. 10.

Fig. 12 is a fragmentary detail sectional view of the feed-dog mountingtaken substantially on the line 12-12 of Fig. 10.

Fig. 13 is a fragmentary elevational view of the needle thread tensiondevice of the machine illustrated in Fig. 1.

Fig. 14 is a view similar to Fig. 13 but illustrating the parts in adifferent position.

Fig. 15 is a sectional view taken substantially on the line 15-15 ofFig. 14.

Fig. 16 is a fragmentary plan view of the bed of the machine illustratedin Fig. l, with the cloth plate removed, showing the looper threadtake-up mechanism.

Fig. 17 is an enlarged fragmentary sectional view taken substantially onthe line 17-17 of Fig. 16.

Figs. 18, 19 and 20 are sectional views similar to Fig. 17 butillustrating the parts in different positions of operation.

Fig. 21 is a fragmentary plan view of the bed with the cloth plate andthe supporting bracket removed and illustrating a diiferential feedingmechanism in place of the plain feeding mechanism of Fig. 1.

Fig. 22 is a sectional view taken substantially on the line 22-22 ofFig. 21.

Fig. 23 is a fragmentary detail sectional view taken substantially onthe line 23-23 of Fig. 22.

Fig. 24 is a rear elevational view, partly broken away, of the mechanismillustrated in Fig. 21.

Fig. 25 is a fragmentary detail sectional view taken substantially onthe line 25-25 of Fig. 21.

Fig. 26 is a fragmentary vertical sectional view longitudinally of themachine of Fig. 1 and illustrating an alternating presser mechanismapplied thereto.

Fig. 27 is a horizontal sectional view taken substantially on the line27-27 of Fig. 26;

Fig. 28 is a fragmentary horizontal sectional view on an enlarged scaleof the head end of the machine as illustrated in Fig. 27.

Fig. 29 is a fragmentary head end elevational view of the alternatingpresser mechanism as illustrated in Fig. 27.

Fig. 30 is a sectional view taken on the line 30-30 of Fig. 28.

Fig. 31 is a detail sectional view taken substantially on the line 3131of Fig. 16.

Fig. 32 is a detail view in elevation of a portion of the looper threadtake-up mechanism.

Fig. 33 is a fragmentary sectional view taken substantially on the line33-33 of Fig. 16.

Fig. 34 is a head end elevational view of the sewing machine of Fig. land illustrating a close coupled top puller feed mechanism appliedthereto.

Fig. 35 is a fragmentary rear elevational view of the head of the sewingmachine illustrated in Fig. 34.

Fig. 36 is a detail sectional view taken substantially on the line 36-36of Fig. 35.

Fig. 37 is a detail sectional view taken substantially on the line 3737of Fig. 35.

In the drawings there is illustrated a sewing machine having a bed 1from one end of which rises a vertical hollow standard 2 that carries ahollow bracket-arm 3 terminating in a head *4. The top of thebracket-arm 3 is open to provide access to the mechanism therein and isadapted to be closed by a cover plate 5. A face plate 6 is provided toclose the open end of the head 4.

With reference to Figs. 4 and 5, the bed 1 is divided by a transversevertical wall 7 upstanding from a bottom wall 8 into a closedsplash-lubricated compartment 9, which is to the right of the wall 7 inFig. 4, and a space 10 outside the closed compartment 9 foraccommodating the lower feed and looper mechanisms of the machine. Theclosed splash-lubricated compartment!) is surrounded by a front wall 11,a rear wall 12, and an end wall 13; For convenience, that portion of thecom.- partment 9 which is below the standard 2 is referred to as astandard section 14, and the remainder of the compartment 9 is referredto as a bed section 15.

The standard section 14 of the bed compartment 9 is open at the bottomfor access and is normally closed by an oil-tight gasketed plate 14asecured in place by screws 14b. The standard section 14 is also open atthe top within the confines of the standard 2 and thus communicates withthe hollow interior of the standard 2. The bed section 15 is open-at thetop and is closed by a gasketed oil-tight cover plate 16. Awork-supporting cloth plate 17 extends over the bed section 15 and thespace 10 and is mounted on the cover plate 16 and, above the space 10,is supported by a bracket 18. Fig. 16, which is in turn mounted at theleft front corner upon the top of a support 19 upstanding from thebottom wall 8, at the left rear corner on a post 20 screwed into thebottom wall 8, at the right front and rear corners on bosses Hand 22respectively extending laterally from the wall 7. The bracket 18supports the throat plate 23 and for this purpose is provided with twothreaded apertures 24 for receiving throat plate fastening screws 25.The cloth plate 17 is provided with an aperture 26 to accommodate thethroat plate 23 and a pair of plates 27 and 28. The plate 27 isremovably secured in place by a snap connector comprising a resilientspring wire clip 29, Figs. 16 and 31, secured to the underside of thebracket 18 and cooperating with a necked portion on. a stud 30 thatextends downwardly from the plate 27 and through a hole 31 in thebracket 18. Removal of the plate 27 is facilitated by a finger hole 32,Fig. 2. The plate 28 is also adapted to be secured in place by a pair ofsnap fasteners similar to the one for the plate 27 and including springwire clips 33 and 34, the clip 33 being secured to the underside of thecloth plate 17 and the clip 34 being secured to the underside of thebracket 18. i

Disposed between the bed section 15 and the standard section 14 is ashort, transverse upstanding bearing boss 35, Fig. 4. The main shaft 36of the machine is arranged longitudinally of the bed 1 in a bearingbushing 37 in the boss 35 and in a bearing bushing 38 carried by aninsert 39 in the end wall 13. Mounted upon the exposed end of the mainshaft 36 is a combined hand wheel and belt pulley 40, Fig. l, which ishollow to receive a counterweight 41 and is closed by a cover plate 42.

As best seen in Figs. 2 and 9, the standard 2 is mounted to the rear ofthe bed 1 and rises vertically therefrom with the hollow interior of thestandard open to the interior of the standard section 14 of the bedcompartment 9. As seen in Fig. 2, the bracket-arm 3, which is mountedupon the top of the standard 2, extends diagonally across the bed, or inother words, is angled forwardly relative to the bed 1 and main shaft 36so that the head 4 is disposed adjacent to the front of the machine.This arrangement places the point of stitch formation very close to thefront of the machine and thereby increases the visibility of theoperator and facilitates manipulation of the work. It is also many timesnecessary for the operator to reach behind the head for manipulation orhandling of the work which is facilitated by having the head 4 arrangedforwardly of the standard 2. Also to facilitate reaching behind the head4, the standard 2 has a cutaway portion 43, Figs. 1 and 3. located atthe front corner adjacent to the working surface of the machine. Theangled arm is also advantageous in the combination thereof in thepresent machine with a stepped or offset needle-bar drive rock lever anda pair of attachment drive shafts journaled in the bracketarm, ashereinafter discussed.

N eedle mechanism The needle mechanism of the present machine is bestshown in Figs. 3, 4, 8 and 9, and comprises a needle-bar 44 mounted forendwise reciprocation in bearing bushings 45 and 46 in the head 4. Theillustrated machine is adapted to sew a double seam, i.e., twotwo-thread chain stitch lines of stitches, so there is secured to thelower end of the needle bar 44, by a needle clamp 47, a pair of needles48. Within the head 4, there is secured to the needle-bar 44 a collar 49having a needle thread take-up arm 50 secured thereto. The take-up arm50 extends through a slot 51 in the head 4 and is provided with twothread eyes 52. The collar 49 is also provided with an arm 53 that isconnected by a pivoted link 54 to one arm 55 of a needle-bar drive rocklever, designated generally at 56, which is arranged longitudinally ofthe bracket-arm 3. In addition to the arm 55, the rock lever 56 includesa hub 57 and a second arm 58 extending from the hub 57 in the oppositedirection from the arm 55. The hub 57 has a bore that receives a pivotshaft 59 journaled for oscillation on a horizontal axis transversely ofthe bracket-arm 3 in bearing bushings 60 and 61. The free end of the arm58 is secured to a connecting rod 62 by a ball and socket jointincluding a ball 63 upon the end of a stud 64 that is secured in alongitudinal bore in the end of the arm 58 and a twopart socketincluding a separable element 65. The lower end of the connecting rod 62has a two-part strap including a separable element 66, which strapsurrounds a crank 67 formed on the main shaft 36 and havingcounterbalances 68. Thus, upon rotation of the main shaft 36,oscillation will be imparted to the rock lever 56, which will in turnimpart oscillation to the needle-bar 44.

The assembly openings in the bracket-arm 3 for the pivot shaft 59 areclosed at the front by a plate 69 and at the rear by a plate 70 having astud 71 with a threaded end and upon which a sewing light (not shown) isadapted to be secured.

The specific construction and arrangement of the needle-bar rock lever56, particularly with relation to a aera's'ei pair of attachment drivingshafts, is hereafter more fully discussed.

Looper mechanism The herein described looper mechanism has been dividedfrom this application and now forms the subject matter of divisionalapplication Serial No. 734,182, filed May 9, 1958.

The looper mechanism of the present machine is disclosed in Figs. 4, 5and and comprises a looper bar 72 disposed in the space 10 in the bed 1and mounted for oscillation and for axial sliding movement in adirection parallel to the axis of the main shaft 36 in a bearing bushing73 carried by a boss 74 extending upwardly from the bottom plate 8 ofthe bed and a bearing bushing 75 carried by the wall 7. A looper carrier76 is mounted on the looper bar 72 by means of a split-ring connectionhaving a clamping screw 77. A pair of straight-line type threaded chainstitch loopers 78 are mounted on the looper carrier 76, the loopershaving cylindrical shanks 79 that are received within vertical bores inthe looper carrier 76 and locked in adjusted position by set screws 80.Each of the loopers 78 is adapted to cooperate individually with one ofthe needles 48 in the formation of a two thread chain stitch line ofstitching, axial reciprocation of the looper bar 72 impartingloop-seizing or advance and loop-shedding or return motions to theloopers 78, and oscillation of the looper bar 72 imparting theloop-spreading or needleavoiding motions to the loopers. The loopers areuniversally adjustable to obtain the desired setting relative to theneedles 48 in that the looper carrier 76 can be adjusted axially andangularly of the looper bar 72 and the shanks 79 of the loopers 78 canbe adjusted axially and angularly relative to the looper carrier 76.

The looper bar 72 extends through the bearing 75 into the bed section ofthe closed bed compartment 9 and the end thereof is secured by auniversal joint 81 to one end of a connecting rod 82. The universaljoint 81 comprises a yoke 83 on the end of the looper bar 72, the yokebeing apertured to receive pivotally a pin 84. Mounted on the pin 84between the arms of the yoke 83 and secured thereto by a set screw 85 isa sleeve 86 having integral therewith a yoke 87 apertured transverselyto the axis of the sleeve 86 to receive pivotally a pin 88. Mounted onthe pin 88 between the arms of the yoke 87 and secured thereto by a setscrew 89 is a sleeve 90 formed upon the end of the connecting rod 82.

The opposite end of the connecting rod 82 is secured by a universaljoint 91 to a crank pin 92, the universal joint 91 comprising a sleeve93 mounted upon and secured by a set screw 94 to a pin 95 that ispivotally mounted in the arms of a yoke 96 having integral therewith ahub or sleeve 97 that is in turn pivotally mounted upon the crank pin92. The sleeve 97 is held on the crank pin 92 by a screw 98.

The drive for the looper mechanism comprises a bevel gear 99 securedupon the end of the main shaft 36 which extends through the bearingbushing 37 into the bed section 15 of the closed bed compartment 9. Thegear 99 meshes with a similar gear 100 on a looper drive shaft 101journaled for rotation transversely of the bed in a bearing bushing 102in the rear wall 12 and in a bearing bushing 103 in a boss 104 risingfrom the bottom wall 8 of the bed at a point spaced from the front wall11. Mounted upon the end of the shaft 101 is a counterbalanced crankplate 105. Endwis'e sliding motion of the shaft 101 is prevented by thecrank plate 105 and a collar 106 which are arranged upon opposite sidesof the bearing bushing 104.

The crank pin 92 is integral with a mounting plate 107 and is formedwith the axis thereof skewed rather than. normal to the plane of theplate 107. The plate 107 is mounted in a groove 108 in the face of thecrank plate 105, which groove provides for adjustment ofthe 6 plate 107in a direction radially of the axis of the looper drive shaft 101, andit is secured in adjusted position by screws 109 that extend throughelongated slots 110 in the plate 107 and screwed into the crank plate105.

In Figs. 6 and 7 there is illustrated a modification of the looper drivemechanism including means for eifecting adjustment of the axis of thecrank pin 92 toward and away from a position parallel to the axis of theshaft 101, which means comprises an adjusting screw 111 threaded throughone end of the mounting plate 107 and abutting against the crank plate105 so that when the screws 109 are tightened, the mounting plate 107will abut against the crank plate 105 only at the screw 111 and at theforward edge, thereby tilting the plate.

In operation, upon rotation of the main shaft 36, r0.- tation will beimparted to the looper drive shaft 101, which carries the crank pin 92and will therefore rotate the crank pin 92 about the axis of the shaft101. The throw of the crank pin 92 will, through the connecting rod 82and the universal joints 81 and 91, impart axial sliding to the looperbar 72, which will effect advance and return motions of the loopers 78.At the same time, because of the skewed axis of the crank pin 92, itwill gyrate as it rotatse about the axis of the shaft 101, whichgyration will be transmitted to the looper bar 72 to impart oscillationthereto that will efiect the loop spreading or needle avoiding motionsof the loopers 78. Adjustment of the advance and return motion of theloopers is provided by the screws '109 and the slots 1'10, andadjustment of the loop spreading motion of the loopers may be providedby the adjusting screw 111.

As seen in Fig. 4 the looper drive shaft 101 is disposed above the levelof the looper bar 72. The mechanics of this construction will producethe desired rapid loopseizing motion of the looper and a retardedloop-shedding motion.

For assembly purposes, there is provided van aperture 112 in the rearwall 12 and an aperture 113 in the front wall 11 in axial alignment withthe looper drive shaft 101, which apertures are closed by cover plates114 and 115 respectively. The aperture 113 is large enough to permitpassage therethrough of the looper drive shaft 101 with crank plate 105and the mounting plate 107 as.- sembled thereon.

In the above construction in which the looper motion is longitudinallyof the bed, the number of needles and cooperating loopers is limited totwo or three and they are limited to narrow gauges. One of the basicobjectives of the present invention is to provide a universal machinewhich can be readily modified and fitted for different specific sewingoperations. Accordingly, one of the primary advantages of the presentlooper mechanism is that there can be readily substituted therefor alooper mechanism having loopers movable transversely of the bed, thusproviding for a larger number of needles or for wider gauges. In such aconstruction, the crank pin 92 is arranged normal to the mounting plate107 and is made with a small throw to impart only a small axial movementto the looper bar 72, which movement is now the needle-avoiding motion.For the advance and return movement, the looper drive shaft 101 isjournaled only in the boss 104 to provide clearance for extending themain shaft 36 through the bed section 15 of the compartment 9, and aneccentric is mounted on the extension and is connected by a pitman andcrank to the looper bar to oscillate the same.

Presser mechanism The presser mechanism of the machine is illustrated inFigs. 3, 4, 8 and 9, and comprises a short hollow presser bar 116mounted in the head 4 for vertical sliding movement in a bearing bushing117 in the bottom of the head. At its lower end, the presser bar 116bassecured thereto by a screw 118 a presser foot 119. The presser 'bar116 has an axial bore -120 extending inward

